Chartbeat is a tool that lets you monitor activity on your site in real time. After integrating, you'll be able to view a dashboard that shows which pages are most popular at the moment, how many users are currently viewing your site, where they're located, how they came to your site, etc.

We imagine that this tool could be useful in allowing organizations to know how many supporters are currently using your site – and where they're from – and the most popular petitions at any given time. It will also allow you to see, in real time, the effects of blast emails and twitter / facebook shares.